JPH05281519A - Liquid crystal display element and manufacture thereof - Google Patents

Liquid crystal display element and manufacture thereof

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Publication number
JPH05281519A
JPH05281519A JP7669692A JP7669692A JPH05281519A JP H05281519 A JPH05281519 A JP H05281519A JP 7669692 A JP7669692 A JP 7669692A JP 7669692 A JP7669692 A JP 7669692A JP H05281519 A JPH05281519 A JP H05281519A
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liquid crystal
material
step
crystal display
temperature
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Japanese (ja)
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Junji Nakajima
潤二 中島
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Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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Priority to JP7669692A priority Critical patent/JPH05281519A/en
Publication of JPH05281519A publication Critical patent/JPH05281519A/en
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Abstract

PURPOSE: To realize high contrast and low voltage drive by providing a grid-like structure member including a high polymer dispersion type liquid crystal component within a high polymer dispersion type liquid crystal element.
CONSTITUTION: A grid-like structure member 3 including at least a photo polymerization material is formed between glass substrates 1 with a transparent electrode, the paired electrode sides of which are placed in opposite to each other, and in the other area than occupied by the structure member, a nematic state liquid crystal material is contained in the form just like a plurality of capsules with the photo polymerization material. The manufacturing method includes the step of applying ultraviolet radiation to a cell through a photo mask at a temperature of not less than the phase change temperature of a used liquid crystal material to make a liquid crystal in capsule-like form with a high polymer. Next, the temperature of the cell is dropped and the photo mask is removed and then an ultravioletray is applied thereto at a higher temperature than the phase change temperature of a light modulating layer structure material which is held therebetween. A vertical light is made incident upon the substrate when no voltage is applied thereto. The diffraction is produced by a difference in index of refraction between the liquid crystal layer and the grid-like structure member 3, so that the incident light is diffracted and the zero-dimensional light in the vertical direction is greatly reduced.
COPYRIGHT: (C)1993,JPO&Japio

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、例えば、動画ディスプレイ、光シャッター等に利用される液晶表示素子およびその製造方法に関するものである。 The present invention relates to, for example, the present invention relates to a liquid crystal display device and a manufacturing method thereof are utilized video displays, optical shutters, and the like.

【0002】 [0002]

【従来の技術】液晶表示素子の中でも、配向処理を要さないため製造が容易にできること、そして、偏光板を要さないため明るい表示が可能なことを利点とする液晶樹脂複合体を使った高分子分散型液晶表示素子が近年、動画ディスプレイ等に対して着目されて来ている。 Among the Prior Art A liquid crystal display device, it can be easily manufactured because requiring no alignment treatment, and, using a liquid crystal polymer composite material to advantage that it is possible bright display for not requiring a polarizing plate Recently a polymer dispersion type liquid crystal display device, has come is focused on the moving display.

【0003】高分子分散型液晶素子とは液晶を樹脂マトリックス中に分散保持された液晶樹脂複合体を一対の電極付基板間に挟み込んだもので、液晶の常光屈折率と樹脂マトリックスの屈折率がほぼ一致するように構成されたものである。 [0003] The polymer dispersed liquid crystal device in which sandwich the liquid crystal polymer composite material dispersed holding the liquid crystal in the resin matrix between the substrates with a pair of electrodes, the liquid crystal of the ordinary refractive index and the refractive index of the resin matrix those that are configured to substantially coincide. すなわち、電圧無印加の状態では、液晶が分散されているポリマーとの壁面付近では壁面に対してほぼ平行に配向している。 That is, in the state of no voltage application, in the vicinity of the wall surface of the polymer liquid crystal is dispersed and oriented substantially parallel to the wall surface. この状態で基板に垂直な光が入射すると、樹脂マトリックスの屈折率と液晶の屈折率とが異なった状態となるため、界面にて光が散乱する。 When the incident light perpendicular in this state to the substrate, since the state in which the refractive index of the liquid crystal refractive index different of the resin matrix, the light at the interface is scattered.

【0004】そして、基板間に電圧を印加すると、正の誘電異方性を有すネマティック液晶の場合、液晶分子が電極面にほぼ垂直に整列し、入射光に対し、樹脂マトリックスの屈折率と液晶の常光屈折率とがほぼ一致することとなるため、光が透過する状態となる。 [0004] When a voltage is applied between the substrates, when a nematic liquid crystal having a positive dielectric anisotropy, the liquid crystal molecules are substantially vertically aligned to the electrode surface, the incident light, the refractive index of the resin matrix since the fact that the liquid crystal of the ordinary refractive index is substantially matched, which allows light to pass through.

【0005】この特徴を利用して表示が可能となっている。 [0005] has become can be displayed by using this feature. しかしながら、偏光板を用いないため、0N-OFFのコントラストが従来の偏光板を用いる表示モ−ドに比べ、 However, because of not using the polarizing plate, the display mode contrast 0N-OFF uses a conventional polarizer - compared to de,
劣りがちである。 Poor tend.

【0006】 [0006]

【発明が解決しようとする課題】高分子分散型液晶を用いた表示モ−ドは、前記のように電界の有無で散乱−透過をスイッチングするもので、電圧無印加状態では完全に光が散乱し、受光部に最小の透過光が到達するようになるのが理想である。 Display using polymer dispersed liquid crystal [0006] mode - de is scattered by the presence or absence of an electric field as described above - as to switch the transmission, fully light scattering in the absence of an applied voltage and, the minimum of the transmitted light to the light receiving portion is to arrive is ideal. しかしながら、現実には理想よりも多くの光が透過してしまっている。 However, we've passed through more light than ideal in reality. この電圧無印加状態の散乱性能を向上させることが、このモ−ドの性能向上につながり、鮮明な表示を可能にする。 Improving the scattering performance of the voltage non-application state, the motor - lead to de improved performance, enabling a clear display.

【0007】また、高分子分散型液晶は、TNモ−ドの表示素子に比べてかなり駆動電圧が高い。 [0007] The polymer dispersed liquid crystal, TN mode - considerably high driving voltage compared to the display device De. これは、あらゆる面で欠点を備えている。 It has a disadvantage in all aspects. 例えば、ショ−トを起こす危険性、消費電力の問題、TFT駆動上の問題などである。 For example, sucrose - danger of causing bets, the problem of power consumption, and the like problems on the TFT driving.

【0008】本発明は、これらの問題点を解決し、ハイコントラスト性と低電圧駆動が可能な液晶表示素子及びその製造方法を提供することを目的とする。 [0008] The present invention is to solve these problems, and an object thereof is to provide a high contrast and low voltage driving the liquid crystal display device and a manufacturing method thereof capable.

【0009】 [0009]

【課題を解決するための手段】前記課題を解決するために本願発明の液晶表示素子は、高分子分散型液晶素子内に、この高分子分散型液晶成分からなる格子状構成体を持つことを特徴とするものである。 Means for Solving the Problems A liquid crystal display device of the present invention to solve the above problems, the polymer dispersed in the liquid crystal element, to have a grid-like structure made of the polymer dispersed liquid crystal component it is an feature.

【0010】 [0010]

【作用】前記構成において、電圧無印加時に基板に垂直な光を入射すると、液晶層の屈折率と格子状構成体の屈折率との差によって、回折が発生する。 [Action] In the configuration, when incident light perpendicular to the substrate when no voltage is applied, the difference between the refractive indices of the grid-shaped structure of the liquid crystal layer, diffraction occurs. これにより、入射光が回折され、垂直方向の0次光が大幅に減少する。 Thus, the incident light is diffracted, vertical 0-order light is greatly reduced.
この効果が高分子分散型液晶の散乱効果に加わり、光遮蔽効率を向上させる。 This effect is applied to the scattering effect of the polymer-dispersed liquid crystal, improve the light-shielding efficiency.

【0011】 [0011]

【実施例】以下、具体例について説明する。 EXAMPLES The following specific example will be described.

【0012】(実施例1)一対の全面にITO 電極を施したガラス基板を13.0μm のスペーサーにより、ギャップ差をつけ、注入口部分を残し、エポキシ系シール材により貼り合わせ、空セルを作った。 [0012] (Example 1) pair of the entire surface of the glass substrate subjected to ITO electrodes of 13.0μm spacers, with a gap difference, leaving the inlet portion, bonded with an epoxy sealant, made empty cell .

【0013】そして、40℃において、モノマーとして2- [0013] Then, at 40 ° C., as monomers 2-
エチルヘキシルアクリレート(ナカライテスク(株) Ethylhexyl acrylate (Nacalai Tesque (Ltd.)
製)7.41wt% 、オリゴマーとしてビスコート#3700(大阪有機化学工業(株)製)11.21wt%、光硬化開始剤としてDarocur 1173(メルク社製)0.38wt% 、液晶としてE Ltd.) 7.41wt%, Viscoat # 3700 (Osaka Organic Chemical Industry Ltd.) 11.21Wt% as an oligomer, Darocur 1173 (Merck) 0.38Wt% as a photocuring initiator, E as the liquid crystal
−8[NI point=72 ℃](BDH 社製)81.0wt% を透明な状態になるまで撹拌混合した。 -8 [NI point = 72 ℃] were mixed and stirred until the (BDH Ltd.) 81.0wt% to a transparent state. 次に、この透明な組成物を前記の空セルに注入した後、73℃にまで温度を上昇させた。 Then, after injection of the clear composition to the empty cell of the the temperature was raised to the 73 ° C.. 引続き、(図1)のようなパタ−ンを持つフォトマスク(ピッチ4 μm ,ストライプ格子)をセル表面にかぶせ、73℃で1分間程放置してから紫外線(57mW/c Subsequently, pattern, such as (1) - covered Photo with emission mask (pitch 4 [mu] m, the stripe grating) to the cell surface, UV left to stand for about 1 minute at 73 ° C. (57 mW / c
m 2 ,5秒)を照射した。 It was irradiated with m 2, 5 sec). 続いて、温度を2 ℃/1min の速度で42℃まで降下させた後、一定に保持する。 Subsequently, after lowering the temperature to 42 ° C. at a rate of 2 ° C. / 1min, kept constant. 最後に、 Finally,
フォトマスクを取り外し、1分間程放置した後に、紫外線(57mW/cm 2 ,5秒)を照射し、(図2)のような断面構造のパネルを得た。 Remove the photomask, after standing for about 1 minute, and irradiated with ultraviolet rays (57 mW / cm 2, 5 seconds) to obtain a panel of sectional structure as shown in (Fig. 2). この格子状構成体の屈折率は電圧印加時の屈折率とほぼ同一であった。 The refractive index of the grid-like structure was almost identical to the refractive index when a voltage is applied.

【0014】こうして製造された素子は気泡もなく、全面にわたって均一な散乱性能を示した。 [0014] Thus prepared device is neither bubbles showed uniform scattering performance over the entire surface. この素子に30H 30H to the device
z,7V の交流電圧を印加すると、全面が透過状態になり、電圧のON-OFFにより透過−散乱制御が可能であった。 z, when applying an AC voltage of 7V, the entire surface is in a transmissive state, transmitting the ON-OFF of the voltage - it was possible to scatter control.

【0015】この素子に光を垂直に照射した時、電圧無印加時の光透過率は約0.28% であった。 [0015] When irradiated with light in this device vertically, the light transmittance when no voltage is applied is about 0.28%. さらに、実効値 In addition, the effective value
7Vの電圧を印加したところ透過率は約84% となった。 Transmittance was applied with a voltage of 7V was about 84%. よって、7Vの駆動においてコントラスト比約300 の表示がなされた。 Therefore, display contrast ratio of about 300 is made in driving 7V.

【0016】(比較例1)これに対し、格子状構成体を持たないポリマ−分散型液晶の場合、13μm のセル厚で、電圧無印加時の透過率は約0.58wt% で、7V印加時約 [0016] (Comparative Example 1) In contrast, polymers not having a grid-like structure - For dispersion type liquid crystal, the cell thickness of 13 .mu.m, transmittance during no voltage application is approximately 0.58 wt%, when 7V is applied about
81wt% 、コントラスト比は約140であった。 81 wt%, the contrast ratio was about 140. また、従来は特開平3-58021号公報に記載されているように同様の測定方法でコントラスト比は約160 以下であった。 Further, the conventional contrast ratio in the same measurement method as described in JP-A-3-58021 were about 160 or less.

【0017】(実施例1)及び(比較例1)と同様にして、セル厚を変化させ、(実施例2〜5)及び(比較例2〜5)を得た。 [0017] In the same manner as Example 1 and Comparative Example 1, by changing the cell thickness, was obtained (Examples 2-5) and (Comparative Examples 2-5). その結果を(表1)に示す。 The results are shown in (Table 1).

【0018】それぞれの素子に対し、電圧無印加時の光透過率をT 0 、7Vの電圧印加時の光透過率をT 7V 、その時のコントラストをCRとする。 [0018] For each element, no voltage is applied when the light transmittance T 0, 7V the light transmittance T 7V when a voltage is applied, the contrast at that time the CR.

【0019】回折の影響で、散乱性能の向上による電圧無印加時の光透過量が大幅に減少した。 [0019] In the influence of diffraction, the light transmission quantity when no voltage is applied by improving the scattering performance was significantly reduced. これによりハイコントラストを得ることができた。 In this way it was possible to obtain a high contrast.

【0020】 [0020]

【表1】 [Table 1]

【0021】(実施例6)(実施例1)で使用したフォトマスクのパタ−ンを(図3)のようなマトリックス状のパタ−ンに変えたところ、T 0 =0.24% 、T 7V =85%、C [0021] (Example 6) pattern of the photomask used in Example 1 - matrix of patterns, such as the emissions (Fig. 3) - was changed to down, T 0 = 0.24%, T 7V = 85%, C
R=354となり、散乱性能が向上し、よりハイコントラストを得ることができた。 R = 354, and the improved scattering performance, it was possible to obtain a more high contrast.

【0022】なお、実施例では組成物の混合温度を40℃ [0022] Incidentally, 40 ° C. The mixing temperature of the composition in Example
で説明したが、組成物を混合することにより得られた調光層構成材料の相転移点(23℃)より高く、成分の揮発が見られない(60℃)までの領域温度では同様の結果が得られた。 In has been described, the phase transition point of the light control layer-forming material obtained by mixing a composition (23 ° C.) higher than, not seen volatile components (60 ° C.) similar results in a region temperatures of up to was gotten.

【0023】また、紫外線照射前の1分間放置の工程は、2分間放置でも同様の結果が得られたが、15秒の放置では出来上がるポリマ−分散型液晶の構造に少しのムラが見られた。 [0023] The step of standing one minute before the ultraviolet irradiation, although similar results for 2 min was obtained, the polymer be ready in stand 15 seconds - was observed little unevenness in the dispersion type liquid crystal structure .

【0024】(実施例1)と同様にして、使用する液晶をBL035(メルク社製)、オリゴマ−にアデカ オプトマ− KR-510(旭電化工業(株)製)に変えて、組成割合も同様にして作成しても、格子状構成体を持つことにより、散乱性能を向上させることができた。 [0024] In the same manner as Example 1, the liquid crystal used BL035 (manufactured by Merck), oligomers - the Adeka Optoma - instead of KR-510 (manufactured by Asahi Denka Co., Ltd.), also the composition ratio to be created in, by having the grid-like structure, it was possible to improve the scattering performance.

【0025】そして、(表1)のT 7Vの値からもわかるように、駆動電圧も格子状構成体を持つほうが下がっている。 [0025] Then, as can be seen from the values of T 7V (Table 1), the driving voltage has dropped is better with a grid structure.

【0026】(実施例7)光重合性材料に熱硬化性を兼ね備えたエポキシ樹脂アデカオプトマー KS-800(旭電化工業(株)製)を使う。 [0026] Use Example 7 Epoxy resin photopolymerizable material combines thermosetting Adekaoptomer KS-800 (manufactured by Asahi Denka Co.). そこで、第2の工程まで(実施例1)と同様な製造を行ない、続いて、温度を58℃にまで降下させて一定に保ち、30分間放置し、フォトマスクを取り外す第3の工程を行ない、(実施例1)と同様の動作をする表示素子を得た。 Therefore, it performs the same preparation and to the second step (Example 1), followed by constant kept by lowering the temperature to 58 ° C., allowed to stand for 30 minutes, subjected to a third step of removing the photomask to obtain a display device that operates similarly to that in example 1. この場合も(表1)同様に、格子状構成体を有する場合の方が同電圧に対し高いコントラストを得ることができた。 Similarly this case (Table 1), was able to better when having a grid-like structure to obtain a high contrast with respect to the same voltage.

【0027】 [0027]

【発明の効果】以上のように、本発明は高分子分散型液晶素子内にこの高分子分散型液晶と同成分からなる格子状構成体を持つことにより、電圧無印加時における透過する光を回折し、光遮蔽性能を向上させることができる。 As it is evident from the foregoing description, by the present invention having a grid-like structure made of the polymer-dispersed liquid crystal and the same components in the polymer dispersion type liquid crystal element, the light transmitted when no voltage is applied diffracted, it is possible to improve light-shielding performance.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の(実施例1)で使用したフォトマスクのパタ−ンの概略平面図 Down schematic plan view - pattern of the photomask used in Example 1 of the present invention; FIG

【図2】本発明の液晶表示素子の断面図 Cross-sectional view of a liquid crystal display device of the present invention; FIG

【図3】本発明の(実施例6)で使用したフォトマスクのパタ−ンの概略平面図 Down schematic plan view - pattern of the photomask used in Example 6 of the present invention; FIG

Claims (4)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】一対の電極側を対向させた透明電極付基板間に少なくとも光重合性材料からなる格子状構成体が形成されており、前記構成体以外の領域では前記光重合性材料によりネマティック液晶材料が複数カプセル状に包括されてなることを特徴とする液晶表示素子。 1. A lattice-like structure consisting of at least a photopolymerizable material between a pair of transparent electrodes with a substrate having an electrode side is opposed is formed in a region other than the structure nematic by the photopolymerizable material the liquid crystal display element characterized by the liquid crystal material is formed by covering a plurality capsular.
  2. 【請求項2】一対の透明電極付基板の電極側を対向させて、対向間隙間に少なくともネマティック液晶材料と光重合性高分子材料とを含有する組成物を挟持してセルとする第1の工程と、前記セルに対しフォトマスクを介し、使用する液晶材料の相転移温度(N−I点)以上にて、紫外線を照射する第2の工程と、前記液晶を前記高分子でカプセル状にする第3の工程とを持つことを特徴とする液晶表示素子の製造方法。 2. A are opposed to the electrode side of the substrate with a pair of transparent electrodes, a first of the cells to sandwich at least a composition containing a nematic liquid crystal material and a photopolymerizable polymeric material between opposed gap a step, through a photomask to said cell, at the phase transition temperature of the liquid crystal material used (N-I point) or more, a second step of irradiating ultraviolet rays, the liquid crystal in the capsule shape in the polymer the third step in the method of manufacturing the liquid crystal display element characterized by having the.
  3. 【請求項3】第3の工程は、第2の工程以後、セルを温度降下させ、N−I点以下で、挟持されている調光層構成材料の相転移点より高い温度において、フォトマスクを取り外し、紫外線照射する工程を持つことを特徴とする請求項2記載の液晶表示素子の製造方法。 3. A third step, the second step after, to temperature drop of the cell, the following N-I point, at a temperature higher than the phase transition point of the light control layer-forming material which is sandwiched, the photomask removal, a method of manufacturing a liquid crystal display device according to claim 2, characterized by having a step of UV irradiation.
  4. 【請求項4】光重合性高分子材料に熱硬化性を兼ね備えたエポキシ樹脂を使い、第3の工程は、N−I点以下で、挟持されている調光層構成材料の相転移点より高い温度において、高分子を熱硬化させて、液晶を高分子でカプセル状にし、フォトマスクを取り外すことを特徴とする請求項2記載の液晶表示素子の製造方法。 Use 4. The photopolymerizable polymer material in an epoxy resin having both a thermosetting, the third step, the following N-I point, the phase transition point of being sandwiched dimmer layer component at high temperatures, the polymer was allowed to thermally cure, the liquid crystal in the capsule form a polymer, the method of manufacturing the liquid crystal display device according to claim 2, wherein the removing the photomask.
JP7669692A 1992-03-31 1992-03-31 Liquid crystal display element and manufacture thereof Pending JPH05281519A (en)

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US5576866A (en) * 1994-03-25 1996-11-19 Sharp Kabushiki Kaisha Liquid crystal display having polymer walls with a chiral pitch and method for producing the same
US5627665A (en) * 1993-07-15 1997-05-06 Sharp Kabushiki Kaisha Liquid crystal display device and method for producing the same
US5645760A (en) * 1994-06-14 1997-07-08 Sharp Kabushiki Kaisha Polymeric compounds, and liquid crystal element using the same
US5668651A (en) * 1994-03-18 1997-09-16 Sharp Kabushiki Kaisha Polymer-wall LCD having liquid crystal molecules having a plane-symmetrical bend orientation
US5706109A (en) * 1993-04-27 1998-01-06 Sharp Kabushiki Kaisha Liquid crystal display with polymeric support
US5784134A (en) * 1994-02-23 1998-07-21 Sharp Kabushiki Kaisha Liquid crystal display device and a method of fabricating the device using transparent-electrodes as a photomask
USRE38288E1 (en) * 1993-04-27 2003-10-28 Sharp Kabushiki Kaisha Liquid crystal display with polymeric support
CN102253438A (en) * 2011-08-02 2011-11-23 昆山龙腾光电有限公司 Electric wetting lens and forming method thereof
CN103217829A (en) * 2012-01-18 2013-07-24 三星显示有限公司 Display apparatus and method of manufacturing the same
US8570461B2 (en) 2009-12-08 2013-10-29 Samsung Electronics Co., Ltd. Polymer-dispersed liquid crystal display device and method of manufacturing the same
US8854596B2 (en) 2010-12-16 2014-10-07 Samsung Electronics Co., Ltd. Active optical device employing refractive index variable regions
EP3104415A1 (en) * 2015-06-11 2016-12-14 Samsung Display Co., Ltd. Display device and method of manufacturing the same

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE38288E1 (en) * 1993-04-27 2003-10-28 Sharp Kabushiki Kaisha Liquid crystal display with polymeric support
US5706109A (en) * 1993-04-27 1998-01-06 Sharp Kabushiki Kaisha Liquid crystal display with polymeric support
US5627665A (en) * 1993-07-15 1997-05-06 Sharp Kabushiki Kaisha Liquid crystal display device and method for producing the same
US5784134A (en) * 1994-02-23 1998-07-21 Sharp Kabushiki Kaisha Liquid crystal display device and a method of fabricating the device using transparent-electrodes as a photomask
US5870162A (en) * 1994-02-23 1999-02-09 Sharp Kabushiki Kaisha Liquid crystal display device and a method of fabricating the device using transparent-electrodes as a photomask
US5668651A (en) * 1994-03-18 1997-09-16 Sharp Kabushiki Kaisha Polymer-wall LCD having liquid crystal molecules having a plane-symmetrical bend orientation
US5576866A (en) * 1994-03-25 1996-11-19 Sharp Kabushiki Kaisha Liquid crystal display having polymer walls with a chiral pitch and method for producing the same
US5702642A (en) * 1994-06-14 1997-12-30 Sharp Kabushiki Kaisha Polymeric compounds, and liquid crystal element using the same
US5645760A (en) * 1994-06-14 1997-07-08 Sharp Kabushiki Kaisha Polymeric compounds, and liquid crystal element using the same
US8570461B2 (en) 2009-12-08 2013-10-29 Samsung Electronics Co., Ltd. Polymer-dispersed liquid crystal display device and method of manufacturing the same
US8854596B2 (en) 2010-12-16 2014-10-07 Samsung Electronics Co., Ltd. Active optical device employing refractive index variable regions
CN102253438A (en) * 2011-08-02 2011-11-23 昆山龙腾光电有限公司 Electric wetting lens and forming method thereof
CN103217829A (en) * 2012-01-18 2013-07-24 三星显示有限公司 Display apparatus and method of manufacturing the same
EP3104415A1 (en) * 2015-06-11 2016-12-14 Samsung Display Co., Ltd. Display device and method of manufacturing the same

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